March 2014 update

Task/Flatten-a-list/JavaScript/flatten-a-list-1.js

@@ -0,0 +1,5 @@
+function flatten(list) {
+  return list.reduce(function (acc, val) {
+    return acc.concat(val.constructor === Array ? flatten(val) : val);
+  }, []);
+}

Task/Flatten-a-list/JavaScript/flatten-a-list-2.js

@@ -0,0 +1,5 @@
+let flatten = list => {
+  return list.reduce(
+    (a, b) => a.concat(Array.isArray(b) ? flatten(b) : b), []
+  );
+}

Task/Flatten-a-list/JavaScript/flatten-a-list.js

@@ -1,5 +0,0 @@
-function flatten(arr){
-    return arr.reduce(function(acc, val){
-        return acc.concat(val.constructor === Array ? flatten(val) : val);
-    },[]);
-}